I'm wondering if anyone knows if zebra danios (danio rerio) can survive the winter in any of the southern US states (TX, FL, sourthern CA, etc...) either in an outdoor pond or somewhere more natural like a stream or bay. I've found some web pages where people claim to have found zebra danios in the wild, but it's not clear to me if they are really established anywhere. Any details (where and when) would be really appreciated. I'm a postdoc interested in comparing laboratory fish to more wildtype ones, without going to the Himalayas and getting truly native fish. I'm a novice so any input would be appreciated.

February 4, 20122:12 pm

Martin Tversted

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Many danios and related fish can easily take at least down to 10C. Especially species from northern India and northern/highland Myanmar. Many are much more cold hardy than what you would be lieve. Ive had a few Danio magaritatus below 10C for a few weeks now.

Martin

February 4, 201210:00 pm

jfb

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Hi Martin, thanks for the info. Are the fish outdoors (and if so where approximately) or is the 10C you mention in a controlled environment?

Many danios and related fish can easily take at least down to 10C. Especially species from northern India and northern/highland Myanmar. Many are much more cold hardy than what you would be lieve. Ive had a few Danio magaritatus below 10C for a few weeks now.

Martin

February 5, 20128:17 am

Martin Tversted

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In a controlled environment. All my aquarias are in a garage where it gets cold in winter. This means that I can follow whats going on during winter, plants whitering down, the turtles dig themself down into the mud, the fish moves around slower, the newts just doing what newts are doing despite any low temperature /smile.gif" style="vertical-align:middle" emoid=":)" border="0" alt="smile.gif" /> etc. Actual it was not my intention to cold test this particular species but I gave away a lot of last years breeding and the species as a whole but a few specimens were forgotten.